So let’s start with the fish.
http://en.wikipedia.org/wiki/Pacu_(fish)
Powerful build, slab sided with a big tail, but not a pointy shaped sprinter like a barracuda.
Small mouth for it’s size with crushing and grinding teeth, not sharp and pointy teeth for grabbing and holding or cutting. Teeth look a lot like ours! Yes, it bites through mono easily, but not because the teeth are sharp like a Toman’s teeth, rather because it has a very powerful crushing bite.
Teeth designed for crushing hard outer casings of fruits, nuts, seeds and berries, not eating other fish. It will have a go at a golf ball in Tow Foo, but probably not take a live baited Kelih. Possibly eats crustaceans - crabs and shrimps and crayfish with hard outer shells that need crushing?
Monocular vision (eyes set on the side of it’s head), so good all round visibility, but not good for judging distances. Certainly not an ambush preditor.
Probably omnivorous. Few fish will pass up a worm or a grub, even if they are not apex preditors.
Mouth pointing forward. Allows it to feed midwater and in particular off the surface, where many fruits, seeds and berries are found. Will also “up end” and pick food up from the bottom, but not a grubber of the bottom, like a catfish. Free swimming fish, not one that sits around and doesn’t move much.
Probably doesn’t expect it’s food to move? Hence the references to long pauses when lure fishing.
Inhabits pay ponds. According to the references, can be eaten and might even be quite good!
